docs: def addPolypeptide(
              self, polypeptide_id, polypeptide_label=None,
              transcript_id=None, polypeptide_type=None):
          """
          :param polypeptide_id:
          :param polypeptide_label:
          :param polypeptide_type:
          :param transcript_id:
          :return:
  
          """
          if polypeptide_type is None:
              polypeptide_type = self.globaltt['polypeptide']
          self.model.addIndividualToGraph(
              polypeptide_id, polypeptide_label, polypeptide_type)
          if transcript_id is not None:
              self.graph.addTriple(
                  transcript_id, self.globaltt['translates_to'], polypeptide_id)
  
          return